You may not get Computer Science with a rank of 6,800. KIIT cutoff for CSE stays around 5000. The 2022 expected cutoff for CSE is 5054. However, your rank will be eligible for other branches such as IT, Electronics, Electronics, and Telecommunication. KIIT offers an option to shift branches after first year. If you maintain a CGPA above 8.5, you can apply for branch change.
One of my friends graduated from KIIT and here are a few things you should keep in mind. Though it is ambitious to have such high hopes, in reality, it will be impossible.
If you get IT there, you should take that opportunity. This is because the placements are the same for both branches. After the 1st semester if you get a CGPA of around 8.5 you can change branches as well.